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Improved process for working up the oil bearing residues of the destructive hydrogenation of carbonaceous materials or the products obtained by extraction of substances of the nature of coal
Improvements in and apparatus for the working up of substances containing asphalt, such as tars, petroleum, destructive hydrogenation products of coals and the like by separation of asphalt therefrom
Improvements connected with the Recovery of Bye-products from the Tar Resulting from the Treatment of Such Carbonaceous Materials as Coal for the Production of Fuel.